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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d2cf564af1e247cd5b2f17b7b8a0ca8c89662f3b8dd5844d51f1791d513e83' 
  AND token = 'u56xF1FDZrg8U4kYLua+ga4W3MpLcV+S3gcaco2dGEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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