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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cee5ba095c1db5278e627f3819956da44db7256275575d6bb0d276d008b5cf' 
  AND token = 'PbJkZwppfXcaeLW88RcppjDyRoGx1Imc1HD/brFRZU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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