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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ba3097872f457902f4904d67800389c4d317477206d2fe41a1ab22224d635e' 
  AND token = 'tMfT63rCAba9U9D8EM2wPyxb56PQxFAG5mqdPjxIGlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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