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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883bd47342c0a0a57f808a16acd2d7a898d9b2098111486ee2f4e32beaa7a175' 
  AND token = '50WqIYkcb2ge5EMap6Qq++Qu2fCkQciiWQ3/rGRi7xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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