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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017c5e71e884b9db3cb1c3d728c8b2336c4d99b135186598591f249871bbcb70' 
  AND token = 'hs1/nADv5LQ0/Y2IkiFCDm4IIr0/TUZO0BYegJ76Tmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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