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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ec290d43a8efe1f4c3c192e642f157430581eb7230dd7cec7c71558f76c05f' 
  AND token = 'aLDfOP47g+uP/qFunp91IPmibrRBi8b85ERYsDKtg+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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