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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86458272ae5155ff764b71fa099eaa65c5baec786c2cd532174781fb48ba409e' 
  AND token = '9i4xnkhgijnemP+nY5D+qhpeyEXG1if4UDAgm5f8IBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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