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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520b8041e291bacac9c8dd81f7041c070f4d6033890b4de0459362a6cef97ef4' 
  AND token = 'lYRL2m6TdzehjNAqARAP2/mDcE26dT06xYx7Jd4fCJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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