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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ff1f907954544c706897d28fc37ca05e6614b1900c764283e11a2694870832' 
  AND token = 'VZihAk/khso6TaU2v7a6F3SPV6IVVhTucfs4O2563fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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