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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ab23b8e8faae561e248695c12f1daabfd386063e75cbffe88d366f6a536993' 
  AND token = 'depxd843ym+n66q+JtAoRAyIX4E57PFMKlbj5hAmitY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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