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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f126cfcac2001c4b113db0e49d0ea90514a2f3f155156e2dc96fd67a646710f' 
  AND token = '9n50ZaHR2q3q+0n1M29tPTOiEIwSMYSHf1qilCGjKIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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