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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3ee9acda9bc9adcc1bcdf67005faaf83721c47399588ede9f7d6a6dd90ef47' 
  AND token = '8/33Av+Tymsqq73w7ydT7PTpcNvkDHRiUSnaaqdUT0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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