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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a83c9f23db7ba77de01f60d8a33ef4b9a2f1f25a51d1241c4682bc6625c7f3' 
  AND token = 'OicOSGbP71wKQ4SvBE3IMwVmfdq5m1Z2/qgAqGKS8dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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