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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a7a2a3ac525669cedb11355db2c6bca927a5a2d37821684f5d5d71c29a33fa' 
  AND token = 'tHtiV51MzuvEfe5hv5aZuxhtlaDJEqga9hs7b7dgdkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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