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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af86473693a81743adf7ffd982d0df656515a59611a356661cbd7eeef04176e' 
  AND token = 'qKrmSmydc/+kD6N9SMpOGvFtxuxw8aoflixTLasacfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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