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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9184eabb1500f255f20ed72fc1b87ff9d44418af52bd96ef1884565c4e674ead' 
  AND token = 'wM3ifdrUE3sXEwvsOY4lnf07movZfjDdxoqWCajFKrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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