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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ec1a1bb7ce17b89c65966c8fe7f2a3f9f6cd5f47d359c9831e67e36bef6156' 
  AND token = 'y9AHs6FK2JaYUDnG/xkLtZdT2QQ+mwTD7LLHwWBEgmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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