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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a57ed2e721828d79d9e48b5e1cc1c121625f6d0b01ddd3e010e80b026737edb' 
  AND token = 'pr5h7UnLJprqYMaOLileWQKRi1GO9LMmJPSEmELpsQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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