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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58656d99935987fc2918eae5769fce2525ba8e44af01c2e11226a3ad24e148c6' 
  AND token = 'SBhuJAZwjedev9dhT8tbuCi3JOf3fXAxR7Lqnud7RMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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