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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a53ebafc329671607598d2c85338c4e518a61ab83ad9f605c0ebaae51d8c28' 
  AND token = 'VYCWfihMUnI9LbPt3Ho5OfZicl2ml/a7TFDXX8fmmoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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