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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bf40fbdbecf992f20b402a2e809ef5e9004c8eca46ee5e5eea622b7728e0fa' 
  AND token = 'Tins3g74rtcjRTGHPKiXL8+vBOkwHtDoqDLtQbxea0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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