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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f56bce51fb0ce23b1aae551a6dc67c629acf0361de7302807477b2cf0886691' 
  AND token = 'xCUv+GgxGGO96bvKqTQjWP1QJwcnb4EI3tqY1V09dVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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