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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cf77424088b1b8ba4bb8d4f2851e79493fdc91c1cfd9a602c4a946ef7f53a1' 
  AND token = '2eA1GEm/jByjzJBFF3ytZr2KNHA1a+d9lw4hXT9uelM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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