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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee183ca16208d225aae0027a82f3d3baf35c30bc9958f4aee24e25841bea2683' 
  AND token = 'wsF2M0+3y81ayOtXaouNDeOVK3SPJB0TcYybV31US+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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