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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a37925b1e28a6b985ffa74cfbea49e530cfd3b21acc8dcd54e56c4e0227462' 
  AND token = 'AwH97Yr3BJjESvUgGk6ZhJIxH93mkubJ5m4wZdHc4iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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