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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f516a5dd7dea7bffaa3a53d7e2ff0a3d00c4c2e199f5f54f9c2176fcd573adb3' 
  AND token = 'Ub0DRWS0/MUL0/8tMv2NgR+wga3zqZwQrpHUR/Jtrs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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