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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b735e739554bdff983a3852e0cfe10c98ed2b48b85161603a06c5ae10a94a7' 
  AND token = 'otys8dsowg7CSXAqFf4vvoW69/mAVLDVjOlIy4PJvLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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