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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9d23a4d88579a4aeaadd117ebf79764bb83260b572a276e3d85acb51c09cbe' 
  AND token = 'oap1PZAXmktLBwqzA3N7zI7tCSKmYL3On9J9iQN7ppc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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