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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b489ea7dd3d5e34929fbb60571e9706419ed3400e1e1413ae26f7fdf1af965' 
  AND token = 'qLfzy7jCdU58mujGyIFb7PTEzxkJOegNlD9bh8yH4Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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