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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0541f35c3eed23d861f7e1e40cd995e5df709f3a1b6a82be464bd7f7ad9d11' 
  AND token = 'UbHd6XPb9MLHgX1eiS95yhnEHTAuecVTg4tEdvVsfto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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