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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de52bb1faf8930190cadaeba91ef537b59d7e56184b96fd3c529a5e2ee646fbe' 
  AND token = 'NnvfEBGBh4KdABbO6QCKTQ2VMaoUB7T7njSMNsNKJQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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