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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236ed727a366c26a3158771f0f5eaadad404b87e95cae64ba5452d66105d7630' 
  AND token = 'Z0IFH1dQK5/b5HjPGMlA+BEbLUj0sXPfVSjpcn0syPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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