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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0af86b69f0ea02af67299a4896f802eb3f069def3cfe3e8abb56588002bd99' 
  AND token = 'FFCq24imV7x+ia4Pi+FG4e/eOMxdKKWfSIb/U7JGKqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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