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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e5a5d50c07883e9464e39c4046e7320ef8ecc0ec5202a4802b82de54d82e63' 
  AND token = 'Db+Qmdnt2zAInWS6ZajnZR+9W/l9SelhHF+iLnbG7wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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