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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e398e019e10210a52396e915787b62f4e67ff8f4c5a2bebaa00f3f38c633e0' 
  AND token = 'puFv4nd2JwrMwLarHicqD2LgXTiO4id00GqS8yLZjBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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