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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e79a1996dabdbc618f11849dad737788361bd0c2917ebd3b7920420ff009036' 
  AND token = '0PQaN0qDbPtebXR8F38e4PlkXG69hvEappGloW5g8TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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