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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03144074364c7c0f66b455c39114b2d61fa75338641f2d8fb174f048f65a6e51' 
  AND token = 'waoiltRDe7YhPd+WLPmBrLyBhX+9ntuRBa7Z66+uFa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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