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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc698cacc53ed69341e35adf8d33bd8a77678a407755a10386cbe5be11bbe571' 
  AND token = 'iM0mh/e4bmk073Tu7AXceXH4lcJn/BpBeE6rdM+ChfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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