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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8f67fd606189aa9cc45b30382fd8c8b30cb9e7e23ca7454dc8cfb5094dbc12' 
  AND token = '8I0I0pMYJimPXZIdJSzBO50dtByLLDza9qHjdP1hmEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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