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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cfe811e554c4ca22055b67d30835ce197234e8b7e37b31fd0b473cfe09820c' 
  AND token = 'fPS3KSmpxh0pPJp3kwoL2ZpA2k0n2utwZtlhsDEcad8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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