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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd07057cc971f7cd1ead12c5c32a7e187e72e20815ddb0bce944a74b70be89c' 
  AND token = 'fVaiQujQuSzbkAorcrb41bPnBrIj1tTrTMkfjGqTc94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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