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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009b7a5c551540fbfd93d14ffe64f4b65c17e146902ad1ac410a41927b6eb53b' 
  AND token = 'fWu7mysLXmu8i+inuNc+LGg37wB+KsVL7zIY/jeiXtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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