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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40836df90b7f4c81328587626a07968da4cf4ee90209a8ea5fa16b72585e7586' 
  AND token = '5M1hPeNfd0F2GOVj7Q25tJ3zh/b0Jg/CHYHDNFF1Qac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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