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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98906660aa7f6b915d854ecb540196815ff9d743ef52101ffb6b0b8ddc22e5e' 
  AND token = '3Mh6LKxgIQIz7dGYMHX1JwfO74LMDhyB0zeFmml9zrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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