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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1b1831664d9f9a2aa496e81542d93029bd94103da5457746ff1591474f7b24' 
  AND token = '1moYMsvOlipCL1VeBtzPrucWhsu4pBsKoqPPWtAsET0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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