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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf38b2227a85aa40252b1498ee40e7a0c804c3785057df88a03f5f2ec00ac24d' 
  AND token = 'qJXOV+zAhVWq3FJcGFPBNhwd6PRde7AA4ZE7Auog3bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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