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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a4141a3fc22b6c5a94551bd3a08c0e0c9ac240c65aea762503ac0da66b49f3' 
  AND token = 'b0/MVyStFpuVOg8ylsVNXSlZ0YsHpxZ3ZyR3Kr3wXF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}