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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9d5876777a2ceb68c0ee650fd72e35126e23b89139dc9a8a8002015e5f1711' 
  AND token = '9ILyEU2jgpcrFiiMFrQSrY/wreowVy6xTJ3XXA89V5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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