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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95132887940ea0053b75f269cd22381546b94ac46222a1009e176d0548d5d0a' 
  AND token = 'ib1ibefPU4VtIqYqfP9jJai67J6X64jNtxSoNNIUbXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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