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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50740d752ac9a9284338d4908210c24cada643091033a0b8a39c01f66f66ec58' 
  AND token = 'F3kdCmLGhtP33dQNtQQn8NlSbzAEYDvAsiLuWWQxlpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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