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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e555a2d77207544e4775d642d334f34fa1c565a16c293935658240c9d2d732' 
  AND token = 'Z1Ne5LfCnpTJTxx4IAjZYi6Tcr0+KZexDPOpxCjcfwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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