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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb772434130975863058a730ac7fa26ad537c295669d54dbac00f24bda4e51f1' 
  AND token = '0UyXk+hz7xptilffyc87F2aEh6kDE4/GEbBqa6ytvn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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