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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8507cd24204f8f6650ba27bbde5dc9e8de099375b61fe54246db1a7d67df90a9' 
  AND token = '7QUoDKnl2bhqayAaPfJIxgbK8649iZtUjOGjC+ToP4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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