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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930c95e3eaf6547f8cc3791b94a43103cf04be141d3bb19851aee0762ba90922' 
  AND token = '3PLuSAYQWNt55G7LFxViuVn33Q4F5jUKFOi3lARz878=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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