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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426689e7f87a68ddb9ad1cf53d052fe25861577e5b6175e32e58311f667b25a9' 
  AND token = 'Z5MWin1GfNGoOPeL6c2JZSFtVeFgPUOrlI+rEOyzbXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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