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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691a9d9c39bd779445b7526aa36392a026d25066dc278238e82864ac2f4914a2' 
  AND token = 'ynvhzE6DJXTs2DC8NIFW2axn1WnYu0OWOx42/7rhjbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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