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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75e481b1f11902d7ed18ae2029e0f9b5b6960c78c771aef273f8c3418cfbc580' 
  AND token = 'foBWX5fLBQc0VM2B0AiDsfVwRbuwZT1u9QTr2Hh8YYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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