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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc7a0e40f48f6346b495f8971d5092cf8e3dc0d7e7c005667f3b814fc0b2c0b' 
  AND token = 'F14w3EfbEkOmUZr8cL8vFHeMB7dKbJt9W5VpZU7m1UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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