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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008bb23ba402a46e70a563e33ef58d2bc0b5d373b99a616ca6aede85323cf624' 
  AND token = 'CL79oQq8NkoXLKvyLd8dYi8CEzn96TlM9o4LKoXMIgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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