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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a98a317cb380e154e13ab79532fa35f7438ac85aa0baf6361e96768c9a71c9c' 
  AND token = 'kEwk25aKT0zjMejr1/LgsXi7Fqn1ay0xXJCj3oiwqzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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