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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62f173f30197bff35c2598d575c3c28cd55379bcc1bca21978ab0a4e3a9740a' 
  AND token = 'JI4Rwb2mOLoBSb0hWf9gIvI2spIfCF06CnFd83GZsog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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