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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11701e1ac480ed73baa78b29cc3ea07e87ee45d4b765f5865305cdfe319a8ac' 
  AND token = 'NeuI6KfrX2OP+qqyaHg69WuEE7MxKStIh779RhPOUOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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