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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b3c78f6f52d5d4ce82381137da02529536eecec4aaf6a20081c182236c09aa' 
  AND token = 'ZHpyQ+aPZfrVbSFeHuFJl5AYrAgfwsGYoFMaW5J4dH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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