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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e95f8688a1e8798a38299c312bdd5cc85389a41c42dafbea1727aef409ad7f4' 
  AND token = '3CnKXwZ58k1jNc3CG8drtQZqOmZz2e7CEGeURdWDb6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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